      MODULE INMSOIL_METHANECONSTS     
!      
! PARAMETERS FOR PRODUCTION
!
      REAL, PARAMETER ::
     :  RNPP = 100.,         ! NPP (GC/(M**2*MO))
     :  RNPPMAX = 180.,      ! THE MAXIMUM VALUE OF THE NPP
     :  Q100 = 6.,           !
     :  R0 = 0.6/3600.       ! THE CONSTANT RATE FACTOR (MUM/S)
!
! PARAMETERS FOR OXIDATION
!
      REAL, PARAMETER ::
     :  VMAX = 45./3600.,    ! MICHAELIS-MENTEN (MUM/S)
     :  RKM = 5.,            !  COEFFICIENTS (MUM)
     :  Q10 = 2.             ! THE OBSERVED VALUE FOR OXIDATION
!
! PARAMETERS FOR EBULLITION
!
      REAL, PARAMETER ::
     :  RKE = 1./3600.,      ! A RATE CONSTANT OF THE UNIT 1/S
     :  CMIN = 500.,         ! THE CONCENTRATION AT WHICH BUBBLE FORMATION OCCURS (MUM)
     :  PUNVEG = 0.,         ! THE PERCENTAGE OF UNVEGETATED, BARE SOIL
     :  CTHRESH = CMIN*(1.+PUNVEG/100.)
                             !THE THRESHOLD CONCENTRATION FOR BUBBLE FORMATION
!
! PARAMETERS FOR PLANT-MEDIATED TRANSPORT
!
      REAL, PARAMETER ::
     :  RKP = 0.01/3600.,    ! A RATE CONSTANT OF THE UNIT 0.01/S
     :  TVEG = 15.,          ! A FACTOR DESCRIBING THE QUALITY OF PLANT-MEDIATED TRANSPORT AT A SITE
     :  POX = 0.5,           ! A CERTAIN FRACTION OF METHANE OXIDIZED IN
     :                       ! THE OXIC ZONE AROUND THE ROOTS OF PLANTS
     :  RLMIN = 0.,          ! THE PARAMETER FOR FGROW(T)
     :  RL = 4.,             ! THE PARAMETER FOR FGROW(T)
     :  RLMAX = 4.           ! RLMAX=RLMIN+RL
       
       END